Means for cooling permanent metal molds



April 29, 1924. 1,492,017

DE FOREST W. CANDLER MEANS FOR COOLING PERMANENT METAL MOLDS 2Sheets-Sheef] -v Filed May 4. 1922 INVEOR.

A rifl 29 1924, 1,492,017

DE FOREST W. CANDLER MEANS FOR COOLING PERMANENT METAL MOLDS Filed May 41,922

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eaTsnr-Y DE FOREST W. CANDLER, F DETROIT, MICHIGAN, ASSIG'NOR. 'I'OGEORGE HOLLEY, OI DETROIT, MICHIGAN.

MEANS FOR. COOLING PERMANENT METAL HOLDS.

Application filed may 4,

To all whom it may concern:

Be it known that I, Dr. FoREs'r W. CAND- LER, a citizen of the UnitedStates, residing at 2932 West Grand Boulevard, Detroit, in the county ofWayne and State of Michigan, have invented certain new and usefulImprovements in Means for Cooling Permanent Metal Molds, of which thefollowing is a s ecification.

he object of this invention is to rovide meansfor cooling permanent metamolds when used for the continuous production of iron castin s. Thenovel feature is the means EIOVldBd whereby the cooling fluid, preferaly air, is intermittently admitted to the hollow molds, the advantagesof which are that the cooling fluid is used economically, and, what ismore important, should a crack develop in the face of the permanent moldthere will be no pressure of the cooling fluid within the mold duringthe casting o eration so that the castin will not be spoi t by theescape of the coo in fluid through the crack as the escape of 000 mgfluid would cause a depression in the surface of the casting.

An additional object of this invention is to produce soft gray ironcastings by avoiding increasing the cooling rate of the molten iron(which produces hard castings) during the period the molten iron issolidifying in the mold.

Figure I shows a sectional elevation of a molding machine to which theair cooling device has been applied.

Figure II shows diagrammatically in plan the means whereby the coolingfluid is distributed to the various hollow molds. In Figure II, A and A"are the legs for supportmg the base, B is the base, C is the drivingshaft which rotates the turret D,- E is a horizontal rod projecting fromthe turret which supports the hollow molds F and G, H is a rojection ofthe driving shaft C. The shafli I-I carries a casting K, to which itisconnected, whereby the piece K is rotated with the turret D, Z is a pipeentering K and supplies the cooling fluid. The piipe Z is supported bythe stationary elbow which in itsturn is supported by any convenientmeans. The pipe Z fits inside the casting K and leakage of the coolingfluid is, prevented by means of the gland Y. The pipe Z, which isstationary, is provided with a port J through which the cooling fluid is1922. Serial N0. 558,896.

distributed. The casting K is provided with outlets L and M into whichare threaded 4 Operation.

Theoperation of the molding machine itself is described in my co-pendingapplication, Ser. No. 504,988, filed October 3, 1921, which disclosesthe manner in which the molds F and G are separated and the casting,ejected, which is not the subject of the present invention. Immediatelyafter the casti is ejected the cooling fluid is ad'- mitte to the hollowcast iron permanent molds F and G from the elbow X through the valve Kand the ipe O and its outlets P and Q. The pipe is so adjusted in theelbow X that t e outlet J comes opposite the openin leading to the pipe0 in the casting K ust after the casting is ejected from the molds F andG.. Immediate y before the molten iron is poured into the molds F and G,after they have come together once more, the opening J ceases to connectwith the passa e 0, so that the air no longer flows through t e mold. Bythus cutti ofi the flow of cooling fluid just rior to t e pouring of theiron in the mo d it appears that the quantity of air used is conserved.However, what I have found is ofmore importance is that in the eventthere are any small cracks or leakages dueto porosity in the mold, thenif the air pressure is allowed to remain in the mold during the castingoperation itself, the esca e of the cooling air or other cooling fluid trough the cracks in the mold will s oil the casting and cause'othertrouble Wl'llCll will be obvious to any one familiar with the moldingart.

I have found that compressed air, at 15 to 25 pounds persquare inch, isthe most convenient cooling medium to use, as comparatively small pipes.will supply suflicient cooling fluid so that the escaping air will notexceed 700 F., under which condition the cast iron molds will stand upindefinitely even with molten iron at 27 00 F.

- G slide back and forth as the molds are opened and closed during thecasting operation, as described in my co-pending application, Serial No.504,988, referred to above, and hollow passages 1 and 2 are providedthrough the center of the guides E and E. These hollow passages connectwith the hollow bosses 3 and 4, which support the guides E and E Intothe hollow bosses 3 and I Y pipe fittings 5 and 6 are connected bypipeconnections, as shown in Figure II. This pipe 5 isconnected by apipe fitting 6 to the rotating valve K and an inclined passage 7connects thispipe 5 with the interior of the air entrance pipe Z.In'Figure I a corresponding pipe is shown leading to the.

opposite set of mold guides. The air flowing through the guides E and Eprevents the lubricating oil caking and reduces the power necessary todrive the machine.

What is more important, however, is the fact that there is aconsiderable quantity of heat dissipated durin the casting operation.This heat causes t e guides to distort and in order to get continuousoperation cooling is not only desirable but necessary.

By admitting the cooling air after the casting has solidified thecooling rate of the iron is not increased and therefore the tendency forthe cast iron to solidify as white iron is minimized. and the tendencyfor gray iron to form is assisted.

What I claim is:

1. In arotating casting machine having a permanent hollow iron mold, apipesupplying cooling fluid under pressure to $2.1 hollow mold, arotating valve associated with said pipe, an outlet from said valveleading to said hollow mold whereby the flow of the cooling fluid isautomatically cut oil during the pouring period.

2. In a rotating casting machine in which castings are successivelpoured and ejected at each revolution of he casting machine,

a hollow metal mold, a, stationary pipe supplying cooling fluid underpressure to said hollow mold, a rotating valve associated with saidpipe, an outlet from said valve leading to said hollow mold whereby theflow of cooling fluid is -automatically out off during the pouringperiod.

3. In a rotating casting machine in which castings are successivelypoured and ejected at each revolution of the casting machine,

a plurality of hollow metal molds, a stationary pipe supplying coolingfluid under pressure to said hollow molds, a rotating valve associatedwith said pipe, a pluralityof outlets from said valve leading tosaidhollow metal molds whereby the flow of cooling fluid is successivelycut ofl from each hollow mold during the pouring period.

4. In a rotating castingmachine havin a permanent hollow iron mold, a pie suppying air under pressure'to said ho ow mold, rotating valveassociated with said pipe, an outlet from said valve leading to saidhollow mold, whereb the flow of air is .automatically out 0 during thepouring period.

5. In a rotating casting'machine in which castings are successivelypoured and ejeqted ,at each revolution of the casting machine, a,

hollow metal mold, a stationary pipe supplying air under pressure tosaid hollow mold, a rotating valve associated with said pipe, anoutletfrom said valve leading to said hollow mold whereby the flow of air isautomatically out 01f during the pouring period.

6. In a rotating casting machine in which castings are successivelypoured and ejected at each revolution of the casting machine, aplurality of hollow metal molds, a stationary pipe supplying air underpressure to said hollow molds, arotating valve associated with saidpipe, a plurality of outlets from said valve leading to said hollowmetal molds whereby the flow of air is successively cut off from eachhollow mold during the pouring period.

7. Ina rotating casting machine having a plurality of permanent metalmolds, slidably mounted upon rotating guides, hollow passages withinsaid guides, and a plurality of pipes conveying cooling fluid to saidpassages within said hollowguides, for the purpose described.

In testimony whereof I aflix my signature.

ns r-onns'r w. OANDLER.

